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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7793af353b2b0985d05482e59bf059192e33027d69902a1b28c88bc93d00484' 
  AND token = '0QrL6V6nwJ2g7pqLkGyDZs9JbKuuEf6H6hwfWZQdr4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}